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(5t+-21)+(4t+-16)=180
We move all terms to the left:
(5t+-21)+(4t+-16)-(180)=0
We add all the numbers together, and all the variables
(5t-21)+(4t-16)-180=0
We get rid of parentheses
5t+4t-21-16-180=0
We add all the numbers together, and all the variables
9t-217=0
We move all terms containing t to the left, all other terms to the right
9t=217
t=217/9
t=24+1/9
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